Image sensor module and camera module

ABSTRACT

An exemplary image sensor module includes a plate, an image sensor, and a number of conductive wires. The plate includes a top surface, a bottom surface, an light passing through hole, and a number of conductive pads on the top surface. The sensor includes a first surface and a number of bonding pads corresponding to the respective conductive pads. The first surface opposes the bottom surface. The first surface includes a light sensitive region aligned with the through hole, and a light insensitive region surrounding the light sensitive region. The insensitive region is mounted on the bottom surface. The bonding pads are arranged on the light insensitive region. The wires pass through the light passing through hole, and respectively electrically connect the bonding pads to the corresponding conductive pads.

BACKGROUND

1. Technical Field

The present disclosure relates to optical imaging and, particularly, to an image sensor module, and a camera module having the image sensor module.

2. Description of Related Art

Image sensor modules having an image sensor are essential devices that have been widely used in camera modules.

A typical camera module includes an image sensor module, and a lens holder mounted on the image sensor module, having at least one lens received therein. The image sensor module includes a board, and an image sensor mounted on the board. A recess is defined in the surface of the board for receiving the image sensor. The image sensor includes bonding pads with conductive pads opposing the bonding pads, and electrically connecting the bonding pads to the board.

However, because the image sensor is received in a recess, the efficiency of heat dissipation of the image sensor is low. Accordingly, the image quality of the camera module is affected. In addition, if the conductive pads are not equal, there will be gaps between the lower conductive pads and the corresponding bonding pads. Therefore, the path for the current between the image sensor and the board is not complete. Accordingly, the camera module does not work well.

Therefore, it is desirable to provide a new image sensor module, and a camera module having the image sensor module, which can overcome the above mentioned limitations.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a camera module according to a first embodiment.

FIG. 2 is a sectional view of the camera module of FIG. 1, taken along line II-II.

FIG. 3 is a sectional view of a camera module according to a second embodiment.

DETAILED DESCRIPTION

Embodiments will now be described in detail below with reference to drawings.

Referring to FIGS. 1-2, a camera module 100, in accordance with a first embodiment, is shown. The camera module 100 includes a lens module 10, and an image sensor module 20 connected with the lens module 10.

The lens module 10 includes a lens holder 11, and at least one lens 13 received in the lens holder 11.

The lens holder 11 includes a top end 111, a bottom end 113 facing away from the top end 111, and a receiving cavity 115 extending through the top end 111 and the bottom end 113. The receiving cavity 115 receives the at least one lens 13.

In the present embodiment, the lens module 10 further includes an optical filter 15 received in the receiving cavity 115. The filter 15 is arranged between the at least one lens 13 and the image sensor module 20 for selectively transmitting light having certain properties (often, a particular range of wavelengths, that is, range of colours of light), while blocking the remainder. In the present embodiment, the filter 15 is an infrared-cut filter. In alternative embodiments, the filter 15 may instead be an ultraviolet filter, or a low pass filter. In further alternative embodiments, the at least one lens 13 may be arranged between the filter 15 and the image sensor module 20. In still further alternative embodiments, the filter 15 may be arranged on the end surface of the top end 111.

The image sensor module 20 receives light from the lens module 10 and converts the light into electronic signals image data. The image sensor module 20 includes a plate 21, an image sensor 23, and a number of conductive wires 25 for electrically connecting the image sensor 23 to the plate 21.

The plate 21 may be made of ceramic, glass, plastic, laminate or other suitable material. The plate 21 includes a top surface 211, a bottom surface 212 facing away from the top surface 211. A light passing through hole 213 extending through the top surface 211 and the bottom surface 212, a number of electrically conductive pads 215 arranged on the top surface 211, and at least one passive component 217 (e.g. inductor, capacitor or resistor, etc.) for improving the transmission quality of image signals output from the image sensor 23. In the present embodiment, a peripheral wall of the plate 21 contacts an inner surface of the lens holder 11 in the receiving cavity 115.

The image sensor 23 received in the receiving cavity 115 is a photosensitive element responsive to infrared radiation, ultraviolet radiation, or visible light beams, converts the light into electronic signals. The image sensor 23 includes a first surface 231, and a number of bonding pads 233 arranged on the first surface 231. The bonding pads 233 correspond to the respective electrically conductive pads 215.

The first surface 231 includes a light sensitive region 2311, and a light insensitive region 2313 surrounding the light sensitive region 2311. The light sensitive region 2311 aligns with the light passing through hole 213. The light sensitive region 2311 receives light from the at least one lens 13, and converts light signals into electronic signals. The light insensitive region 2313 opposes the bottom surface 212, and is engaged with the bottom surface 212. In the present embodiment, the light insensitive region 2313 is fixed on the bottom surface 212 with adhesive 27.

The bonding pads 233 are arranged on the light insensitive region 2313 for electrically connecting the image sensor 23 to the electrically conductive pads 215 of the plate 21. In the present embodiment, the bonding pads 233 and the conductive pads 215 are on the two opposite sides of the bottom surface 212, respectively.

The conductive wires 25 pass through the light passing through hole 213, and respectively electrically connect the bonding pads 233 to the corresponding electrically conductive pads 215. In the present embodiment, one end of each conductive wire 25 is connected to the corresponding bonding pad 233, the other end of each conductive wire 25 is connected to the corresponding electrically conductive pad 215.

Because the image sensor 23 is exposed to outside, the efficiency of heat dissipation can be improved. Therefore, the image quality of the camera module 100 can improve. In addition, the conductive wires 25 respectively electrically connect the bonding pads 233 to the corresponding electrically conductive pads 215. Therefore, the open circuit caused by different heights of the conductive pads 215 can be avoided.

Referring to FIG. 3, a camera module 300, in accordance with a second embodiment, is shown. The camera module 300 includes a lens module 30 having a bottom end 313, and an image sensor module 40 connected with the lens module 30.

The image sensor module 40 is similar to the image sensor module 20, and includes a plate 41 and an image sensor 43 electrically connected to the plate 41. The plate 41 includes a top surface 411 for supporting the bottom end 313, and a bottom surface 412. A side wall 415 extending down from a periphery of the bottom surface 412, and the bottom surface 412 cooperatively defines a receiving portion 418 receiving the image sensor 43.

While certain embodiments have been described and exemplified above, various other embodiments will be apparent to those skilled in the art from the foregoing disclosure. The disclosure is not limited to the particular embodiments described and exemplified but is capable of considerable variation and modification without departure from the scope and spirit of the appended claims. 

What is claimed is:
 1. An image sensor module comprising: a plate, the plate comprising a top surface, a bottom surface facing away from the top surface, a light passing through hole extending through the top surface and the bottom surface, and a plurality of electrically conductive pads arranged on the top surface; an image sensor, the image sensor comprising a first surface and a plurality of bonding pads corresponding to the respective electrically conductive pads, the first surface opposing the bottom surface of the plate, the first surface comprising a light sensitive region aligned with the light passing through hole, and a light insensitive region surrounding the light sensitive region, the light insensitive region mounted on the bottom surface of the plate, the bonding pads arranged on the light insensitive region, and a plurality of conductive wires, the conductive wires passing through the light passing through hole, and respectively electrically connecting the bonding pads to the corresponding conductive pads, one end of each conductive wire being connected to the corresponding bonding pad on the light insensitive region, and the other end of each conductive wire being connected to the corresponding electrically conductive pad on the top surface.
 2. The image sensor module of claim 1, wherein the light insensitive region is fixed on the bottom surface of the plate with adhesive.
 3. The image sensor module of claim 1, wherein the plate further comprises a side wall extending down from a periphery of the bottom surface, the side wall and the bottom surface cooperatively define a receiving portion receiving the image sensor.
 4. The image sensor module of claim 1, further comprising at least one passive component mounted on the top surface of the plate.
 5. A camera module comprising: a lens module having at least one lens, and an image sensor module connected with the lens module, the image sensor module comprising: a plate, the plate comprising a top surface, a bottom surface facing away from the top surface, a light passing through hole extending through the top surface and the bottom surface, and a plurality of electrically conductive pads arranged on the top surface; an image sensor, the image sensor comprising a first surface and a plurality of bonding pads corresponding to the respective electrically conductive pads, the first surface opposing the bottom surface of the plate, the first surface comprising a light sensitive region aligned with the light passing through hole, and a light insensitive region surrounding the light sensitive region, the light insensitive region mounted on the bottom surface of the plate, the bonding pads arranged on the light insensitive region, and a plurality of conductive wires, the conductive wires passing through the light passing through hole, and respectively electrically connecting the bonding pads to the corresponding conductive pads, one end of each conductive wire being connected to the corresponding bonding pad on the light insensitive region, and the other end of each conductive wire being connected to the corresponding electrically conductive pad on the top surface.
 6. The camera module of claim 5, wherein the lens module comprises a lens holder, the lens holder comprises a top end, a bottom end, and a receiving cavity extending through the top end and the bottom end, the receiving cavity receiving the at least one lens therein.
 7. The camera module of claim 6, wherein the bottom end is fixed on the top surface of the plate.
 8. The camera module of claim 6, wherein a peripheral wall of the plate contacts an inner surface of the lens holder in the receiving cavity.
 9. The camera module of claim 6, further comprising an optical filter received in the receiving cavity.
 10. The camera module of claim 9, wherein the optical filter is located between the at least one lens and the image sensor module.
 11. The camera module of claim 9, wherein the at least one lens is located between the optical filter and the image sensor module.
 12. The camera module of claim 5, further comprising at least one passive component mounted on the top surface of the plate.
 13. The image sensor module of claim 1, wherein the bonding pads and the conductive pads are on the two opposite sides of the bottom surface of the plate, respectively.
 14. The image sensor module of claim 13, wherein the light insensitive region is fixed on the bottom surface of the plate with adhesive.
 15. The image sensor module of claim 13, wherein the plate further comprises a side wall extending down from a periphery of the bottom surface, the side wall and the bottom surface cooperatively define a receiving portion receiving the image sensor.
 16. The image sensor module of claim 13, further comprising at least one passive component mounted on the top surface of the plate.
 17. The image sensor module of claim 5, wherein the bonding pads and the conductive pads are on the two opposite sides of the bottom surface of the plate, respectively.
 18. The camera module of claim 17, wherein the lens module comprises a lens holder, the lens holder comprises a top end, a bottom end, and a receiving cavity extending through the top end and the bottom end, the receiving cavity receiving the at least one lens therein.
 19. The camera module of claim 18, wherein a peripheral surface of the plate contacts an inner surface of the lens holder in the receiving cavity.
 20. The camera module of claim 17, further comprising at least one passive component mounted on the top surface of the plate. 